If you use Google Chrome and you visit any XenForo powered forums (like RPGfix!), this extension enables you to receive notifications without being on that forum.
The extension checks the sites you go to, to see if XenForo is powering it. If it is, it checks to see if you're logged in. Once you're logged in, it adds that site to the list of sites to check for you. It will check every 5 minutes to see if you have been logged out (session expired), received an alert, or received a message. If you have, a notification will slide into the bottom right corner of your screen.